To pre-tip or not to pre-tip, that is the question

Yesterday, I went to the mall with my family. We were hungry and decided to eat at the new food court. The set up is such that the counters have kiosks with a few additional at the entrance with some of the counters having a worker while others do not. The kiosks were set up so that you choose the eatery you want, put in your order, pay and then provide your cell number where they text you a receipt, and the text again when your order is ready to be picked up. We went to one of the eateries and my brother used the kiosk first, I looked over his shoulder and it appeared that the dreaded 20% tip was auto pre-chosen, but he just quickly hit continue before I could say anything. I went next and confirmed that it was auto-chosen, so I opted to press the no tip button… and so the experiment began whether pre-tipping actually mattered. I guess it doesn’t as I received the “order is ready” text first and the worker was just as friendly with me as he was with my brother. I concluded that to pre-tip or not is up to customers and whether they just want to throw out money to businesses. As for me… I choose not to pre-tip and only tip after service received.